Like
@Hernando has mentioned, it will be unsafe if you are trying to use server API on
clients because there will be abusive use if a player obtains the secret
key. We highly recommend you to implement server API on an external secure
server or on the Cloud Script. We have to double check this with you
because this is important.

I
am not sure what API you are using, but PlayFab is based on RESTful API and
it is stateless and we do not understand what does “check verification
status” mean. We can help if you provide more details.

I understand the thing @Hernando and you( @SethDu) told me how unsafe it is to use server api on client side code. And as I was telling Hernando that I'm using the server api just to check the verification status of my player

I'm not familiar with Android development, but I noticed that you used ServerModels in your code, which is only used when calling ServerAPI. Using the ServerAPI in the client side is a very dangerous behavior and it may leak your Secret Key. So it is not recommended.

If you like, please post your demand scenario, I believe that most scenes will have a safe and effective solution.

In addition, for other Unity side issues, you can get more help from the Unity Community.